A new risk calculation model for complications of hepatectomy in adults over 75.

"Declarations Ethics approval and consent to participateThis study was approved by the ethics committee of the Chinese PLA General Hospital. This study has been performed in accordance with the ethical standards laid down in the Declaration of Helsinki. This is a retrospective study, so informed consent is not involved. Consent for publicationThis study did not contain any identification information about patients and complied with the principle of informed consent. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding No funding was received. All funding for this project be provided by the authors themselves."

"Trial registration The Research Registry: researchregistry8531. https://www.researchregistry.com/browse-the-registry#home/registrationdetails/63901824ae49230021a5a0cf/."